Cryptocurrencies exist for a better future and to solve many problems that we cannot solve today. One of the most important of these problems is security in financial transactions. The digital financial networks through which cryptocurrencies operate are known as blockchain, which is a cumulative database that operates through very complex encryption. One of the advantages of cryptocurrencies is the existence of fast financial transfers at a lower cost, in addition to decentralized systems that do not rely on a single point that could be a source of failure. The downsides include the high volatility in the value of these currencies, the large energy consumption in mining operations, and the potential for them to be exploited in illegal activities, which we will elaborate on in the following lines.